Unable to parse binding expression

[danwalmsley]

IsVisible="{Binding !$parent[cont|MetroWindow].DataContext.LockScreen.IsLocked}"

gives a runtime error.

but:

IsVisible="{Binding !$parent[Window].DataContext.LockScreen.IsLocked}"

works

[kekekeks]

gives a runtime error.

It's Avalonia issue then. Probably something related to the avalonia-specific runtime type resolver.